Building a Cookie Alert as a Web Component

Building a Cookie Alert as a Web Component

Learn how to leverage Web Components technologies to build a cookie alert universal component. Web components are a set of standard specifications for creating custom, reusable HTML elements in Web pages and applications. Their specifications refer to the HTML and DOM standards, of which they are now an integral part.

Learn how to leverage Web Components technologies to build a cookie alert universal component.

Table of Contents

  • Introducing Web components
  • Setting up the component
  • Adding markup and style
  • Adding properties
  • Syncing attributes and properties
  • Handling events
  • Exploiting the shadow DOM
  • Using the Web component everywhere
  • What about browsers compatibility?
  • Summary

While surfing the Web, surely you have noticed that almost all websites show an alert, a banner, a pop-up window or similar informing you about their cookie management policy involving personal data. This is a legislative requirement due to the entry into force of the European General Data Protection Regulation (GDPR) since May 2018.

As a frontend developer, you may have had to implement one of these alerts or in any case to look for one ready to be integrated into your site. Maybe your website is based on Angular or React or Vue or something other and you’d like not to struggle too much with this integration.

Of course, this is just one case where you’d like to have a UI component to be used in your Web application regardless of the UI framework you are using. Surely you have in mind many other situations similar to this one. So, you may be wondering if you can build such framework-free UI components. The Web components technology answers this question.

Introducing Web components

Web components are a set of standard specifications for creating custom, reusable HTML elements in Web pages and applications. Their specifications refer to the HTML and DOM standards, of which they are now an integral part.

Web components are basically based on three features:

  • Custom elements They are a set of JavaScript APIs to create custom DOM elements associated with a specific HTML tag
  • Shadow DOM A set of JavaScript APIs that allow you to manage a specific DOM for a component, independent from the Web page’s DOM
  • HTML template It is an integration to the HTML specifications allowing you to define portions of markup that is not interpreted at the Web page loading but at runtime.

In this article, we will explore the basics of Web components technology in order to implement a simple cookie alert you can use in your Web application independently from the UI framework you are using. You will find the final code of the project in this GitHub repository.

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